Molding-machine.



, D. PARKS. MOLDIN G MACHINE.

APPLICATION FILED FEBIlO. 190B. u

Patented Feb.-2, 1909.

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DENNIS PARKS, OF ST. LOUIS, MISSORI, ASSIGNOR TO MITCHELL-PARKS MANUFACTURING COMPANY, or ST. Louis, Missou RI, A CORPORATION OF MISSOURI.

HOLDING-MACHINE.

Specification of Letters Patent.l

Patented Feb.. 2, 1oo9.

Application filed February 10, i908. Serial No. 415,138.,

To all whom it may concern:

. Be it known that I, DENNIS PARKS, a citizen of the `United States, residing at St. Louis, in the` State of Missouri, have invented new and useful Improvements in Molding-Machines, of which the following is l ered to accomplish the jarring effect with'the aware,

expenditure o but little power and the production of. a minimum of shock'or vibrat1on. rIhe machiney as described andillustrated is adapted `more especially forl making small castings, and it is -intended -itshall be operated manually. 'Ihe invention, however, is not limited to this special character of machine, nor to such mode of operation. In other Words, the invention herein defined would, as `to the principles involved, as defined'in the claims, apply equally well toa machine for makin large castings and operated by mechanica power. So far as I am machines of this general type have been of great Weight, and have required the employment of considerable power to operate them, and usually a specially constructed foundation or base of great rmness to withstand the shocks produced in operation.

Furthermore, the full weight of the movable part of the machine with the flasks and sand was exerted on the fixed art of the machine in arring the sand, resu ting in the production of such extreme shocks or vibrations, that very frequently the sand .in the flasks, which had been packed, and which would be resting on thefoundry fioor, would be shaken loose, necessitating re aeking of such flasks.

It will be obvious t at the weight of the flasks, or the part supporting the flask, has no effect Whatever in acking the sand, and

that it is the weight o the sand itself which causes'the packing thereof when the jar is produced. rIhe'refore, it is apparent that the weight of the flask and its movable support may be counteracted, thus obviating to a large extent shocks and'vibrations, with- 455out in any manner 'affectingithe packing of `said heads to sand itself in the flask may be to a greater or less extent counteracted or even substantially counter-balanced, leaving the degree of shock or the force of the impact to be imparted to the flask to be determinedby the power expended this power be exerted manually or other-wise.

In the drawing ;-Figure 1 is a View in end elevation' of a molding machine constructed according to my invention. Fig. 2 is a view in front elevation of same. Fig. 3 is a section on the line 3--3 of Fig. 2.

The device is constructed in large part of cast iron, and comprises side frame members l, which are connected at their upper ends by twoflat bars or plates 2, oneon either side of the machine.v On the outer side of each of the side frames, guide-bearings 4 are provided in which works a rod 5. The upper end of each of. these rods has extending through it the screw-thread end of a bolt 5, on which is mounted a binding-wheel 6. Pivotally supported on each of the bolts 5 is a cast iron head 7,.said heads being connected by means of bars or plates 8, secured to the bottom of the heads on either side thereof, and having the same width as the bars 2; rlhe bars 8 support the board 9 containing the pattern, and may be held in position by any preferred means.

10 indicates the flask, which is placed on the pattern board position by means of a bar 11. engaging under cleats 12, one of which is adjustably secured on the upper'side of each ofthe heads 7 as shown. 'lhe binding wheels 6 are for the purpose of securing the heads 7 ina fixed position, and, on being loosened, to permit be rotated on their pivots to reverse the position lof the flask. 'As shown in Fig. 2 thev machine may be adapted to accommodate two fi'asks, one of which may be the cope and the other the drag. Pivotally connected to each of the rods 5, intermediate the ends of the latter, as indicated at 13, is a lever 14, the louer end of which is pivotally connected to a short crank-arm .15, which latter is in turn mounted in the side frame member by means of a bolt 16. The construction. is the same on each side of the machine, and the crank arms 15 are rigidly connected by a cross beam 17. On this cross beam is secured a treadle 18. 19- indicates a coil spring which is Iadjustably secured at its by the operator, whetherv thesand, and further, that the'weight ofthe 9, and which is held in upper lend bymeans of a threaded bolt centrally of a frame-member 21 and at its lower end is secured inthe cross-beam 17. The tendency 5 and with them the heads supporting the llask; and the strength of this spring is such that when the flask has no sand in it the ask support will be held above the bumper plates 2, andthe s ring will be practically fully retracted; When the flask is filled with sand, however, the Weight thus added will be suilicient to de ress the rods 'lagainst the resistance of saidp spring, the adjustment ofthe tension ei which is such that the bars 8 supporting the llask will rest lightly on the bu inper plates-2.v In other words, the weight of vthe sandwillbe just sufficient to overcome the tension of the spring, and the ilask support, and the flask or flasks of sand thereon, will have their weight substantially count-en balanced. After the sand is placed in the flask, or flasks, the operator by placing his T foot on the treadle 18 may easily lift the flask support through the medium of rods 5 and. .2.5

thelever mechanism described, and then by releasing pressure on'the treadle permit the 'flask support to drop, the jar resulting from l --the impact of the bars 8 with the bumper i plates 2 causing the sand in the llask to pack "This operation is re 'aboutl thepattern to a greater or lessdegree. eated as often as may be necessary to pack t e sand to the extent desired.j The subsequent manipulation of the lask by'raising the flask support and revers- ,f gthe sameis well known and need not be described.

I claim: l

I. A machine for molding sand by arring embodyingv a substantially counterbalanced reversible member movable into and out-of contact with a fixed part of the machine.

2. A molding machine for packing sand in a lask by jarring comprising, in combination with the frame of the machine, a spring-sup ported movable and reversible flask support. 3. In a moldin machine, in combination with a reciprocal) e and reversible Vflask support, means for substantially counterbalancing the weight of said support with the flask of sandv thereon'. .j

4l' In a molding machine for packing sand in the flask by jarring, a reciprocable and reversible flask su port, a resilient member `normally supporting the weight of said sujrba i port and adapted-to substantiallycounte ance said support `when -the flask of sand is mountedl thereon. '4 i In a molding machine for packing sand of this spring is to lift the rods bers. whereby the -flas by jarring, in combination with a reciproca ble and reversible flask sup Jort, a spring normally supporting the weiglit of said support, and having a tension suiii'cicnt to substantially eounterbalance said support when the flask of sand is mounted thereon.

6. vIn a molding machine, in combination with a reciprocable and reveisible flask support ada ted, by impact with a fixed part of the maelliine to )ack by jarring sand in the flask mounted t iereon, a spring normally holding said support out of contact with said fixed part and adapted to yield under the weight of the sand placed in the flask to permit the support to come in contact with said xed part, and means for reciprocating said support. A

7. In a molding machine, in combination with a fixed part ofthe machine, reciprocable members mounted in the frame of the 1nachine, a flask support mounted on said 1ncmbers and reversible thereon, a spring interposed between the fixed part of the machine and said members tending normally to raise the latter, and means for reciprocating said niembers'to cause said flask support to be brought into and out of contact with the fixed part of the machine for the purposes described.

8. In a molding machine, in combination with a fixed part of the machine, a reciprocable flask support, mechanism for manipulating said llas.; support so that it may by gravity contact with said fixed part and by impact pack the sand in `the flask mounted on said support, and means connected to the fixed part of the machine and the flask manipulating mechanism counter balancing the flask and the flask support for the purposes described.

9.. In a molding machine, in combination with a fixed part of the machine, reciprocable members mounted in the frame of the inachine, a flask support mounted on said members, mechanism for reci irocating said inemllr support may be brought into and out of contact with said fixed part of the machine, and means tending normally to raise said reciprocable members and to substantially counter-balance said su port with a packed flask thereon.

n testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

' DENNIS PARKS. Witnesses: JOHN E. MITCHELL, J. N. Bomann. 

